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<FONT color="green">001</FONT>    package org.bukkit.util;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import org.bukkit.World;<a name="line.3"></a>
<FONT color="green">004</FONT>    import org.bukkit.Location;<a name="line.4"></a>
<FONT color="green">005</FONT>    import org.bukkit.block.Block;<a name="line.5"></a>
<FONT color="green">006</FONT>    import org.bukkit.block.BlockFace;<a name="line.6"></a>
<FONT color="green">007</FONT>    import org.bukkit.entity.LivingEntity;<a name="line.7"></a>
<FONT color="green">008</FONT>    <a name="line.8"></a>
<FONT color="green">009</FONT>    import java.util.Iterator;<a name="line.9"></a>
<FONT color="green">010</FONT>    import java.util.NoSuchElementException;<a name="line.10"></a>
<FONT color="green">011</FONT>    import java.lang.IllegalStateException;<a name="line.11"></a>
<FONT color="green">012</FONT>    <a name="line.12"></a>
<FONT color="green">013</FONT>    /**<a name="line.13"></a>
<FONT color="green">014</FONT>     * This class performs ray tracing and iterates along blocks on a line<a name="line.14"></a>
<FONT color="green">015</FONT>     *<a name="line.15"></a>
<FONT color="green">016</FONT>     * @author raphfrk<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    public class BlockIterator implements Iterator&lt;Block&gt; {<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>        private final World  world;<a name="line.21"></a>
<FONT color="green">022</FONT>        private final int    maxDistance;<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>        private static final int    gridSize = 1 &lt;&lt; 24;<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>        private boolean      end = false;<a name="line.26"></a>
<FONT color="green">027</FONT>    <a name="line.27"></a>
<FONT color="green">028</FONT>        private Block[]      blockQueue = new Block[3];<a name="line.28"></a>
<FONT color="green">029</FONT>        private int          currentBlock = 0;<a name="line.29"></a>
<FONT color="green">030</FONT>        private int          currentDistance = 0;<a name="line.30"></a>
<FONT color="green">031</FONT>        private int          maxDistanceInt;<a name="line.31"></a>
<FONT color="green">032</FONT>    <a name="line.32"></a>
<FONT color="green">033</FONT>        private int          secondError;<a name="line.33"></a>
<FONT color="green">034</FONT>        private int          thirdError;<a name="line.34"></a>
<FONT color="green">035</FONT>    <a name="line.35"></a>
<FONT color="green">036</FONT>        private int          secondStep;<a name="line.36"></a>
<FONT color="green">037</FONT>        private int          thirdStep;<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>        private BlockFace    mainFace;<a name="line.39"></a>
<FONT color="green">040</FONT>        private BlockFace    secondFace;<a name="line.40"></a>
<FONT color="green">041</FONT>        private BlockFace    thirdFace;<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>        /**<a name="line.43"></a>
<FONT color="green">044</FONT>         * Constructs the BlockIterator<a name="line.44"></a>
<FONT color="green">045</FONT>         *<a name="line.45"></a>
<FONT color="green">046</FONT>         * @param world The world to use for tracing<a name="line.46"></a>
<FONT color="green">047</FONT>         * @param start A Vector giving the initial location for the trace<a name="line.47"></a>
<FONT color="green">048</FONT>         * @param direction A Vector pointing in the direction for the trace<a name="line.48"></a>
<FONT color="green">049</FONT>         * @param yOffset The trace begins vertically offset from the start vector by this value<a name="line.49"></a>
<FONT color="green">050</FONT>         * @param maxDistance This is the maximum distance in blocks for the trace. Setting this value above 140 may lead to problems with unloaded chunks. A value of 0 indicates no limit<a name="line.50"></a>
<FONT color="green">051</FONT>         *<a name="line.51"></a>
<FONT color="green">052</FONT>         */<a name="line.52"></a>
<FONT color="green">053</FONT>    <a name="line.53"></a>
<FONT color="green">054</FONT>        public BlockIterator(World world, Vector start, Vector direction, double yOffset, int maxDistance) {<a name="line.54"></a>
<FONT color="green">055</FONT>            this.world = world;<a name="line.55"></a>
<FONT color="green">056</FONT>            this.maxDistance = maxDistance;<a name="line.56"></a>
<FONT color="green">057</FONT>    <a name="line.57"></a>
<FONT color="green">058</FONT>            Vector startClone = start.clone();<a name="line.58"></a>
<FONT color="green">059</FONT>    <a name="line.59"></a>
<FONT color="green">060</FONT>            startClone.setY(startClone.getY() + yOffset);<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>            currentDistance = 0;<a name="line.62"></a>
<FONT color="green">063</FONT>    <a name="line.63"></a>
<FONT color="green">064</FONT>            double mainDirection = 0;<a name="line.64"></a>
<FONT color="green">065</FONT>            double secondDirection = 0;<a name="line.65"></a>
<FONT color="green">066</FONT>            double thirdDirection = 0;<a name="line.66"></a>
<FONT color="green">067</FONT>    <a name="line.67"></a>
<FONT color="green">068</FONT>            double mainPosition = 0;<a name="line.68"></a>
<FONT color="green">069</FONT>            double secondPosition = 0;<a name="line.69"></a>
<FONT color="green">070</FONT>            double thirdPosition = 0;<a name="line.70"></a>
<FONT color="green">071</FONT>    <a name="line.71"></a>
<FONT color="green">072</FONT>            Block startBlock = world.getBlockAt((int) Math.floor(startClone.getX()), (int) Math.floor(startClone.getY()), (int) Math.floor(startClone.getZ()));<a name="line.72"></a>
<FONT color="green">073</FONT>    <a name="line.73"></a>
<FONT color="green">074</FONT>            if (getXLength(direction) &gt; mainDirection) {<a name="line.74"></a>
<FONT color="green">075</FONT>                mainFace = getXFace(direction);<a name="line.75"></a>
<FONT color="green">076</FONT>                mainDirection = getXLength(direction);<a name="line.76"></a>
<FONT color="green">077</FONT>                mainPosition = getXPosition(direction, startClone, startBlock);<a name="line.77"></a>
<FONT color="green">078</FONT>    <a name="line.78"></a>
<FONT color="green">079</FONT>                secondFace = getYFace(direction);<a name="line.79"></a>
<FONT color="green">080</FONT>                secondDirection = getYLength(direction);<a name="line.80"></a>
<FONT color="green">081</FONT>                secondPosition = getYPosition(direction, startClone, startBlock);<a name="line.81"></a>
<FONT color="green">082</FONT>    <a name="line.82"></a>
<FONT color="green">083</FONT>                thirdFace = getZFace(direction);<a name="line.83"></a>
<FONT color="green">084</FONT>                thirdDirection = getZLength(direction);<a name="line.84"></a>
<FONT color="green">085</FONT>                thirdPosition = getZPosition(direction, startClone, startBlock);<a name="line.85"></a>
<FONT color="green">086</FONT>            }<a name="line.86"></a>
<FONT color="green">087</FONT>            if (getYLength(direction) &gt; mainDirection) {<a name="line.87"></a>
<FONT color="green">088</FONT>                mainFace = getYFace(direction);<a name="line.88"></a>
<FONT color="green">089</FONT>                mainDirection = getYLength(direction);<a name="line.89"></a>
<FONT color="green">090</FONT>                mainPosition = getYPosition(direction, startClone, startBlock);<a name="line.90"></a>
<FONT color="green">091</FONT>    <a name="line.91"></a>
<FONT color="green">092</FONT>                secondFace = getZFace(direction);<a name="line.92"></a>
<FONT color="green">093</FONT>                secondDirection = getZLength(direction);<a name="line.93"></a>
<FONT color="green">094</FONT>                secondPosition = getZPosition(direction, startClone, startBlock);<a name="line.94"></a>
<FONT color="green">095</FONT>    <a name="line.95"></a>
<FONT color="green">096</FONT>                thirdFace = getXFace(direction);<a name="line.96"></a>
<FONT color="green">097</FONT>                thirdDirection = getXLength(direction);<a name="line.97"></a>
<FONT color="green">098</FONT>                thirdPosition = getXPosition(direction, startClone, startBlock);<a name="line.98"></a>
<FONT color="green">099</FONT>            }<a name="line.99"></a>
<FONT color="green">100</FONT>            if (getZLength(direction) &gt; mainDirection) {<a name="line.100"></a>
<FONT color="green">101</FONT>                mainFace = getZFace(direction);<a name="line.101"></a>
<FONT color="green">102</FONT>                mainDirection = getZLength(direction);<a name="line.102"></a>
<FONT color="green">103</FONT>                mainPosition = getZPosition(direction, startClone, startBlock);<a name="line.103"></a>
<FONT color="green">104</FONT>    <a name="line.104"></a>
<FONT color="green">105</FONT>                secondFace = getXFace(direction);<a name="line.105"></a>
<FONT color="green">106</FONT>                secondDirection = getXLength(direction);<a name="line.106"></a>
<FONT color="green">107</FONT>                secondPosition = getXPosition(direction, startClone, startBlock);<a name="line.107"></a>
<FONT color="green">108</FONT>    <a name="line.108"></a>
<FONT color="green">109</FONT>                thirdFace = getYFace(direction);<a name="line.109"></a>
<FONT color="green">110</FONT>                thirdDirection = getYLength(direction);<a name="line.110"></a>
<FONT color="green">111</FONT>                thirdPosition = getYPosition(direction, startClone, startBlock);<a name="line.111"></a>
<FONT color="green">112</FONT>            }<a name="line.112"></a>
<FONT color="green">113</FONT>    <a name="line.113"></a>
<FONT color="green">114</FONT>            // trace line backwards to find intercept with plane perpendicular to the main axis<a name="line.114"></a>
<FONT color="green">115</FONT>    <a name="line.115"></a>
<FONT color="green">116</FONT>            double d = mainPosition / mainDirection; // how far to hit face behind<a name="line.116"></a>
<FONT color="green">117</FONT>            double secondd = secondPosition - secondDirection * d;<a name="line.117"></a>
<FONT color="green">118</FONT>            double thirdd = thirdPosition - thirdDirection * d;<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>            // Guarantee that the ray will pass though the start block.<a name="line.120"></a>
<FONT color="green">121</FONT>            // It is possible that it would miss due to rounding<a name="line.121"></a>
<FONT color="green">122</FONT>            // This should only move the ray by 1 grid position<a name="line.122"></a>
<FONT color="green">123</FONT>            secondError = (int) (Math.floor(secondd * gridSize));<a name="line.123"></a>
<FONT color="green">124</FONT>            secondStep = (int) (Math.round(secondDirection / mainDirection * gridSize));<a name="line.124"></a>
<FONT color="green">125</FONT>            thirdError = (int) (Math.floor(thirdd * gridSize));<a name="line.125"></a>
<FONT color="green">126</FONT>            thirdStep = (int) (Math.round(thirdDirection / mainDirection * gridSize));<a name="line.126"></a>
<FONT color="green">127</FONT>    <a name="line.127"></a>
<FONT color="green">128</FONT>            if (secondError + secondStep &lt;= 0) {<a name="line.128"></a>
<FONT color="green">129</FONT>                secondError = -secondStep + 1;<a name="line.129"></a>
<FONT color="green">130</FONT>            }<a name="line.130"></a>
<FONT color="green">131</FONT>    <a name="line.131"></a>
<FONT color="green">132</FONT>            if (thirdError + thirdStep &lt;= 0) {<a name="line.132"></a>
<FONT color="green">133</FONT>                thirdError = -thirdStep + 1;<a name="line.133"></a>
<FONT color="green">134</FONT>            }<a name="line.134"></a>
<FONT color="green">135</FONT>    <a name="line.135"></a>
<FONT color="green">136</FONT>            Block lastBlock;<a name="line.136"></a>
<FONT color="green">137</FONT>    <a name="line.137"></a>
<FONT color="green">138</FONT>            lastBlock = startBlock.getFace(reverseFace(mainFace));<a name="line.138"></a>
<FONT color="green">139</FONT>    <a name="line.139"></a>
<FONT color="green">140</FONT>            if (secondError &lt; 0) {<a name="line.140"></a>
<FONT color="green">141</FONT>                secondError += gridSize;<a name="line.141"></a>
<FONT color="green">142</FONT>                lastBlock = lastBlock.getFace(reverseFace(secondFace));<a name="line.142"></a>
<FONT color="green">143</FONT>            }<a name="line.143"></a>
<FONT color="green">144</FONT>    <a name="line.144"></a>
<FONT color="green">145</FONT>            if (thirdError &lt; 0) {<a name="line.145"></a>
<FONT color="green">146</FONT>                thirdError += gridSize;<a name="line.146"></a>
<FONT color="green">147</FONT>                lastBlock = lastBlock.getFace(reverseFace(thirdFace));<a name="line.147"></a>
<FONT color="green">148</FONT>            }<a name="line.148"></a>
<FONT color="green">149</FONT>    <a name="line.149"></a>
<FONT color="green">150</FONT>            // This means that when the variables are positive, it means that the coord=1 boundary has been crossed<a name="line.150"></a>
<FONT color="green">151</FONT>            secondError -= gridSize;<a name="line.151"></a>
<FONT color="green">152</FONT>            thirdError -= gridSize;<a name="line.152"></a>
<FONT color="green">153</FONT>    <a name="line.153"></a>
<FONT color="green">154</FONT>            blockQueue[0] = lastBlock;<a name="line.154"></a>
<FONT color="green">155</FONT>            currentBlock = -1;<a name="line.155"></a>
<FONT color="green">156</FONT>    <a name="line.156"></a>
<FONT color="green">157</FONT>            scan();<a name="line.157"></a>
<FONT color="green">158</FONT>    <a name="line.158"></a>
<FONT color="green">159</FONT>            boolean startBlockFound = false;<a name="line.159"></a>
<FONT color="green">160</FONT>    <a name="line.160"></a>
<FONT color="green">161</FONT>            for (int cnt = currentBlock; cnt &gt;= 0; cnt--) {<a name="line.161"></a>
<FONT color="green">162</FONT>                if (blockEquals(blockQueue[cnt], startBlock)) {<a name="line.162"></a>
<FONT color="green">163</FONT>                    currentBlock = cnt;<a name="line.163"></a>
<FONT color="green">164</FONT>                    startBlockFound = true;<a name="line.164"></a>
<FONT color="green">165</FONT>                    break;<a name="line.165"></a>
<FONT color="green">166</FONT>                }<a name="line.166"></a>
<FONT color="green">167</FONT>            }<a name="line.167"></a>
<FONT color="green">168</FONT>    <a name="line.168"></a>
<FONT color="green">169</FONT>            if (!startBlockFound) {<a name="line.169"></a>
<FONT color="green">170</FONT>                throw new IllegalStateException("Start block missed in BlockIterator");<a name="line.170"></a>
<FONT color="green">171</FONT>            }<a name="line.171"></a>
<FONT color="green">172</FONT>    <a name="line.172"></a>
<FONT color="green">173</FONT>            // Calculate the number of planes passed to give max distance<a name="line.173"></a>
<FONT color="green">174</FONT>            maxDistanceInt = (int) Math.round(maxDistance / (Math.sqrt(mainDirection * mainDirection + secondDirection * secondDirection + thirdDirection * thirdDirection) / mainDirection));<a name="line.174"></a>
<FONT color="green">175</FONT>    <a name="line.175"></a>
<FONT color="green">176</FONT>        }<a name="line.176"></a>
<FONT color="green">177</FONT>    <a name="line.177"></a>
<FONT color="green">178</FONT>        private boolean blockEquals(Block a, Block b) {<a name="line.178"></a>
<FONT color="green">179</FONT>            return a.getX() == b.getX() &amp;&amp; a.getY() == b.getY() &amp;&amp; a.getZ() == b.getZ();<a name="line.179"></a>
<FONT color="green">180</FONT>        }<a name="line.180"></a>
<FONT color="green">181</FONT>    <a name="line.181"></a>
<FONT color="green">182</FONT>        private BlockFace reverseFace(BlockFace face) {<a name="line.182"></a>
<FONT color="green">183</FONT>            switch (face) {<a name="line.183"></a>
<FONT color="green">184</FONT>            case UP:<a name="line.184"></a>
<FONT color="green">185</FONT>                return BlockFace.DOWN;<a name="line.185"></a>
<FONT color="green">186</FONT>    <a name="line.186"></a>
<FONT color="green">187</FONT>            case DOWN:<a name="line.187"></a>
<FONT color="green">188</FONT>                return BlockFace.UP;<a name="line.188"></a>
<FONT color="green">189</FONT>    <a name="line.189"></a>
<FONT color="green">190</FONT>            case NORTH:<a name="line.190"></a>
<FONT color="green">191</FONT>                return BlockFace.SOUTH;<a name="line.191"></a>
<FONT color="green">192</FONT>    <a name="line.192"></a>
<FONT color="green">193</FONT>            case SOUTH:<a name="line.193"></a>
<FONT color="green">194</FONT>                return BlockFace.NORTH;<a name="line.194"></a>
<FONT color="green">195</FONT>    <a name="line.195"></a>
<FONT color="green">196</FONT>            case EAST:<a name="line.196"></a>
<FONT color="green">197</FONT>                return BlockFace.WEST;<a name="line.197"></a>
<FONT color="green">198</FONT>    <a name="line.198"></a>
<FONT color="green">199</FONT>            case WEST:<a name="line.199"></a>
<FONT color="green">200</FONT>                return BlockFace.EAST;<a name="line.200"></a>
<FONT color="green">201</FONT>    <a name="line.201"></a>
<FONT color="green">202</FONT>            default:<a name="line.202"></a>
<FONT color="green">203</FONT>                return null;<a name="line.203"></a>
<FONT color="green">204</FONT>            }<a name="line.204"></a>
<FONT color="green">205</FONT>        }<a name="line.205"></a>
<FONT color="green">206</FONT>    <a name="line.206"></a>
<FONT color="green">207</FONT>        private BlockFace getXFace(Vector direction) {<a name="line.207"></a>
<FONT color="green">208</FONT>            return ((direction.getX() &gt; 0) ? BlockFace.SOUTH : BlockFace.NORTH);<a name="line.208"></a>
<FONT color="green">209</FONT>        }<a name="line.209"></a>
<FONT color="green">210</FONT>    <a name="line.210"></a>
<FONT color="green">211</FONT>        private BlockFace getYFace(Vector direction) {<a name="line.211"></a>
<FONT color="green">212</FONT>            return ((direction.getY() &gt; 0) ? BlockFace.UP : BlockFace.DOWN);<a name="line.212"></a>
<FONT color="green">213</FONT>        }<a name="line.213"></a>
<FONT color="green">214</FONT>    <a name="line.214"></a>
<FONT color="green">215</FONT>        private BlockFace getZFace(Vector direction) {<a name="line.215"></a>
<FONT color="green">216</FONT>            return ((direction.getZ() &gt; 0) ? BlockFace.WEST : BlockFace.EAST);<a name="line.216"></a>
<FONT color="green">217</FONT>        }<a name="line.217"></a>
<FONT color="green">218</FONT>    <a name="line.218"></a>
<FONT color="green">219</FONT>        private double getXLength(Vector direction) {<a name="line.219"></a>
<FONT color="green">220</FONT>            return(Math.abs(direction.getX()));<a name="line.220"></a>
<FONT color="green">221</FONT>        }<a name="line.221"></a>
<FONT color="green">222</FONT>    <a name="line.222"></a>
<FONT color="green">223</FONT>        private double getYLength(Vector direction) {<a name="line.223"></a>
<FONT color="green">224</FONT>            return(Math.abs(direction.getY()));<a name="line.224"></a>
<FONT color="green">225</FONT>        }<a name="line.225"></a>
<FONT color="green">226</FONT>    <a name="line.226"></a>
<FONT color="green">227</FONT>        private double getZLength(Vector direction) {<a name="line.227"></a>
<FONT color="green">228</FONT>            return(Math.abs(direction.getZ()));<a name="line.228"></a>
<FONT color="green">229</FONT>        }<a name="line.229"></a>
<FONT color="green">230</FONT>    <a name="line.230"></a>
<FONT color="green">231</FONT>        private double getPosition(double direction, double position, int blockPosition) {<a name="line.231"></a>
<FONT color="green">232</FONT>            return direction &gt; 0 ? (position - blockPosition) : (blockPosition + 1 - position);<a name="line.232"></a>
<FONT color="green">233</FONT>        }<a name="line.233"></a>
<FONT color="green">234</FONT>    <a name="line.234"></a>
<FONT color="green">235</FONT>        private double getXPosition(Vector direction, Vector position, Block block) {<a name="line.235"></a>
<FONT color="green">236</FONT>            return getPosition(direction.getX(), position.getX(), block.getX());<a name="line.236"></a>
<FONT color="green">237</FONT>        }<a name="line.237"></a>
<FONT color="green">238</FONT>    <a name="line.238"></a>
<FONT color="green">239</FONT>        private double getYPosition(Vector direction, Vector position, Block block) {<a name="line.239"></a>
<FONT color="green">240</FONT>            return getPosition(direction.getY(), position.getY(), block.getY());<a name="line.240"></a>
<FONT color="green">241</FONT>        }<a name="line.241"></a>
<FONT color="green">242</FONT>    <a name="line.242"></a>
<FONT color="green">243</FONT>        private double getZPosition(Vector direction, Vector position, Block block) {<a name="line.243"></a>
<FONT color="green">244</FONT>            return getPosition(direction.getZ(), position.getZ(), block.getZ());<a name="line.244"></a>
<FONT color="green">245</FONT>        }<a name="line.245"></a>
<FONT color="green">246</FONT>    <a name="line.246"></a>
<FONT color="green">247</FONT>        /**<a name="line.247"></a>
<FONT color="green">248</FONT>         * Constructs the BlockIterator<a name="line.248"></a>
<FONT color="green">249</FONT>         *<a name="line.249"></a>
<FONT color="green">250</FONT>         * @param loc The location for the start of the ray trace<a name="line.250"></a>
<FONT color="green">251</FONT>         * @param yOffset The trace begins vertically offset from the start vector by this value<a name="line.251"></a>
<FONT color="green">252</FONT>         * @param maxDistance This is the maximum distance in blocks for the trace. Setting this value above 140 may lead to problems with unloaded chunks. A value of 0 indicates no limit<a name="line.252"></a>
<FONT color="green">253</FONT>         *<a name="line.253"></a>
<FONT color="green">254</FONT>         */<a name="line.254"></a>
<FONT color="green">255</FONT>    <a name="line.255"></a>
<FONT color="green">256</FONT>        public BlockIterator(Location loc, double yOffset, int maxDistance) {<a name="line.256"></a>
<FONT color="green">257</FONT>            this(loc.getWorld(), loc.toVector(), loc.getDirection(), yOffset, maxDistance);<a name="line.257"></a>
<FONT color="green">258</FONT>        }<a name="line.258"></a>
<FONT color="green">259</FONT>    <a name="line.259"></a>
<FONT color="green">260</FONT>        /**<a name="line.260"></a>
<FONT color="green">261</FONT>         * Constructs the BlockIterator.<a name="line.261"></a>
<FONT color="green">262</FONT>         *<a name="line.262"></a>
<FONT color="green">263</FONT>         * @param loc The location for the start of the ray trace<a name="line.263"></a>
<FONT color="green">264</FONT>         * @param yOffset The trace begins vertically offset from the start vector by this value<a name="line.264"></a>
<FONT color="green">265</FONT>         *<a name="line.265"></a>
<FONT color="green">266</FONT>         */<a name="line.266"></a>
<FONT color="green">267</FONT>    <a name="line.267"></a>
<FONT color="green">268</FONT>        public BlockIterator(Location loc, double yOffset) {<a name="line.268"></a>
<FONT color="green">269</FONT>            this(loc.getWorld(), loc.toVector(), loc.getDirection(), yOffset, 0);<a name="line.269"></a>
<FONT color="green">270</FONT>        }<a name="line.270"></a>
<FONT color="green">271</FONT>    <a name="line.271"></a>
<FONT color="green">272</FONT>        /**<a name="line.272"></a>
<FONT color="green">273</FONT>         * Constructs the BlockIterator.<a name="line.273"></a>
<FONT color="green">274</FONT>         *<a name="line.274"></a>
<FONT color="green">275</FONT>         * @param loc The location for the start of the ray trace<a name="line.275"></a>
<FONT color="green">276</FONT>         *<a name="line.276"></a>
<FONT color="green">277</FONT>         */<a name="line.277"></a>
<FONT color="green">278</FONT>    <a name="line.278"></a>
<FONT color="green">279</FONT>        public BlockIterator(Location loc) {<a name="line.279"></a>
<FONT color="green">280</FONT>            this(loc, 0D);<a name="line.280"></a>
<FONT color="green">281</FONT>        }<a name="line.281"></a>
<FONT color="green">282</FONT>    <a name="line.282"></a>
<FONT color="green">283</FONT>        /**<a name="line.283"></a>
<FONT color="green">284</FONT>         * Constructs the BlockIterator.<a name="line.284"></a>
<FONT color="green">285</FONT>         *<a name="line.285"></a>
<FONT color="green">286</FONT>         * @param entity Information from the entity is used to set up the trace<a name="line.286"></a>
<FONT color="green">287</FONT>         * @param maxDistance  This is the maximum distance in blocks for the trace. Setting this value above 140 may lead to problems with unloaded chunks. A value of 0 indicates no limit<a name="line.287"></a>
<FONT color="green">288</FONT>         *<a name="line.288"></a>
<FONT color="green">289</FONT>         */<a name="line.289"></a>
<FONT color="green">290</FONT>    <a name="line.290"></a>
<FONT color="green">291</FONT>        public BlockIterator(LivingEntity entity, int maxDistance) {<a name="line.291"></a>
<FONT color="green">292</FONT>            this(entity.getLocation(), entity.getEyeHeight(), maxDistance);<a name="line.292"></a>
<FONT color="green">293</FONT>        }<a name="line.293"></a>
<FONT color="green">294</FONT>    <a name="line.294"></a>
<FONT color="green">295</FONT>        /**<a name="line.295"></a>
<FONT color="green">296</FONT>         * Constructs the BlockIterator.<a name="line.296"></a>
<FONT color="green">297</FONT>         *<a name="line.297"></a>
<FONT color="green">298</FONT>         * @param entity Information from the entity is used to set up the trace<a name="line.298"></a>
<FONT color="green">299</FONT>         *<a name="line.299"></a>
<FONT color="green">300</FONT>         */<a name="line.300"></a>
<FONT color="green">301</FONT>    <a name="line.301"></a>
<FONT color="green">302</FONT>        public BlockIterator(LivingEntity entity) {<a name="line.302"></a>
<FONT color="green">303</FONT>            this(entity, 0);<a name="line.303"></a>
<FONT color="green">304</FONT>        }<a name="line.304"></a>
<FONT color="green">305</FONT>    <a name="line.305"></a>
<FONT color="green">306</FONT>        /**<a name="line.306"></a>
<FONT color="green">307</FONT>         * Returns true if the iteration has more elements<a name="line.307"></a>
<FONT color="green">308</FONT>         *<a name="line.308"></a>
<FONT color="green">309</FONT>         */<a name="line.309"></a>
<FONT color="green">310</FONT>    <a name="line.310"></a>
<FONT color="green">311</FONT>        public boolean hasNext() {<a name="line.311"></a>
<FONT color="green">312</FONT>            scan();<a name="line.312"></a>
<FONT color="green">313</FONT>            return currentBlock != -1;<a name="line.313"></a>
<FONT color="green">314</FONT>        }<a name="line.314"></a>
<FONT color="green">315</FONT>    <a name="line.315"></a>
<FONT color="green">316</FONT>        /**<a name="line.316"></a>
<FONT color="green">317</FONT>         * Returns the next Block in the trace<a name="line.317"></a>
<FONT color="green">318</FONT>         *<a name="line.318"></a>
<FONT color="green">319</FONT>         * @return the next Block in the trace<a name="line.319"></a>
<FONT color="green">320</FONT>         */<a name="line.320"></a>
<FONT color="green">321</FONT>    <a name="line.321"></a>
<FONT color="green">322</FONT>        public Block next() {<a name="line.322"></a>
<FONT color="green">323</FONT>            scan();<a name="line.323"></a>
<FONT color="green">324</FONT>            if (currentBlock &lt;= -1) {<a name="line.324"></a>
<FONT color="green">325</FONT>                throw new NoSuchElementException();<a name="line.325"></a>
<FONT color="green">326</FONT>            } else {<a name="line.326"></a>
<FONT color="green">327</FONT>                return blockQueue[currentBlock--];<a name="line.327"></a>
<FONT color="green">328</FONT>            }<a name="line.328"></a>
<FONT color="green">329</FONT>        }<a name="line.329"></a>
<FONT color="green">330</FONT>    <a name="line.330"></a>
<FONT color="green">331</FONT>        public void remove() {<a name="line.331"></a>
<FONT color="green">332</FONT>            throw new UnsupportedOperationException("[BlockIterator] doesn't support block removal");<a name="line.332"></a>
<FONT color="green">333</FONT>        }<a name="line.333"></a>
<FONT color="green">334</FONT>    <a name="line.334"></a>
<FONT color="green">335</FONT>        private void scan() {<a name="line.335"></a>
<FONT color="green">336</FONT>            if (currentBlock &gt;= 0) {<a name="line.336"></a>
<FONT color="green">337</FONT>                return;<a name="line.337"></a>
<FONT color="green">338</FONT>            }<a name="line.338"></a>
<FONT color="green">339</FONT>            if (maxDistance != 0 &amp;&amp; currentDistance &gt; maxDistanceInt) {<a name="line.339"></a>
<FONT color="green">340</FONT>                end = true;<a name="line.340"></a>
<FONT color="green">341</FONT>                return;<a name="line.341"></a>
<FONT color="green">342</FONT>            }<a name="line.342"></a>
<FONT color="green">343</FONT>            if (end) {<a name="line.343"></a>
<FONT color="green">344</FONT>                return;<a name="line.344"></a>
<FONT color="green">345</FONT>            }<a name="line.345"></a>
<FONT color="green">346</FONT>    <a name="line.346"></a>
<FONT color="green">347</FONT>            currentDistance++;<a name="line.347"></a>
<FONT color="green">348</FONT>    <a name="line.348"></a>
<FONT color="green">349</FONT>            secondError += secondStep;<a name="line.349"></a>
<FONT color="green">350</FONT>            thirdError += thirdStep;<a name="line.350"></a>
<FONT color="green">351</FONT>    <a name="line.351"></a>
<FONT color="green">352</FONT>            if (secondError &gt; 0 &amp;&amp; thirdError &gt; 0) {<a name="line.352"></a>
<FONT color="green">353</FONT>                blockQueue[2] = blockQueue[0].getFace(mainFace);<a name="line.353"></a>
<FONT color="green">354</FONT>                if (((long) secondStep) * ((long) thirdError) &lt; ((long) thirdStep) * ((long) secondError)) {<a name="line.354"></a>
<FONT color="green">355</FONT>                    blockQueue[1] = blockQueue[2].getFace(secondFace);<a name="line.355"></a>
<FONT color="green">356</FONT>                    blockQueue[0] = blockQueue[1].getFace(thirdFace);<a name="line.356"></a>
<FONT color="green">357</FONT>                } else {<a name="line.357"></a>
<FONT color="green">358</FONT>                    blockQueue[1] = blockQueue[2].getFace(thirdFace);<a name="line.358"></a>
<FONT color="green">359</FONT>                    blockQueue[0] = blockQueue[1].getFace(secondFace);<a name="line.359"></a>
<FONT color="green">360</FONT>                }<a name="line.360"></a>
<FONT color="green">361</FONT>                thirdError -= gridSize;<a name="line.361"></a>
<FONT color="green">362</FONT>                secondError -= gridSize;<a name="line.362"></a>
<FONT color="green">363</FONT>                currentBlock = 2;<a name="line.363"></a>
<FONT color="green">364</FONT>                return;<a name="line.364"></a>
<FONT color="green">365</FONT>            } else if (secondError &gt; 0) {<a name="line.365"></a>
<FONT color="green">366</FONT>                blockQueue[1] = blockQueue[0].getFace(mainFace);<a name="line.366"></a>
<FONT color="green">367</FONT>                blockQueue[0] = blockQueue[1].getFace(secondFace);<a name="line.367"></a>
<FONT color="green">368</FONT>                secondError -= gridSize;<a name="line.368"></a>
<FONT color="green">369</FONT>                currentBlock = 1;<a name="line.369"></a>
<FONT color="green">370</FONT>                return;<a name="line.370"></a>
<FONT color="green">371</FONT>            } else if (thirdError &gt; 0) {<a name="line.371"></a>
<FONT color="green">372</FONT>                blockQueue[1] = blockQueue[0].getFace(mainFace);<a name="line.372"></a>
<FONT color="green">373</FONT>                blockQueue[0] = blockQueue[1].getFace(thirdFace);<a name="line.373"></a>
<FONT color="green">374</FONT>                thirdError -= gridSize;<a name="line.374"></a>
<FONT color="green">375</FONT>                currentBlock = 1;<a name="line.375"></a>
<FONT color="green">376</FONT>                return;<a name="line.376"></a>
<FONT color="green">377</FONT>            } else {<a name="line.377"></a>
<FONT color="green">378</FONT>                blockQueue[0] = blockQueue[0].getFace(mainFace);<a name="line.378"></a>
<FONT color="green">379</FONT>                currentBlock = 0;<a name="line.379"></a>
<FONT color="green">380</FONT>                return;<a name="line.380"></a>
<FONT color="green">381</FONT>            }<a name="line.381"></a>
<FONT color="green">382</FONT>        }<a name="line.382"></a>
<FONT color="green">383</FONT>    }<a name="line.383"></a>




























































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